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Statistics

Describing Data

Describing data is an important skill. Data visualization allows readers to get a concept of the data from a single display. To describe qualitative data we can break data down into categories called classes.

 A class is one of the categories into which qualitative data can be classified.
 The class frequency is the number of observations in the data set that fall into a particular class.
 The class relative frequency is the class frequency divided by the total number of observations in the data set; that is,  $class\,relatve\,frequency\,=\frac{class\,frequency}{n}$
 The class percentage is the class relative frequency multiplied by 100; that is,  $class\,percentage\,= (class\,relative\,frequency) \times 100$

With the above calculations you can display the data in a bar graph or pie chart.